Pck. Lo et Ml. Snapper, Intramolecular [2+2]-photocycloaddition/thermal fragmentation approach toward 5-8-5 ring systems, ORG LETT, 3(18), 2001, pp. 2819-2821
An intramolecular [2 + 2]-photocycloaddition is used to provide a photoaddu
ct, which upon fragmentation, lactone cleavage, and subsequent Cope rearran
gement provides a dicyclopenta[a,d]cyclooctene ring system with substituent
s in place (e.g., C3 and C11) to access several 5-8-5 diterpene and sestert
erpene natural products.